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themes/bootstrap/templates/file/file-link.html.twig

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+{#
+/**
+ * @file
+ * Theme override for a link to a file.
+ *
+ * Available variables:
+ * - attributes: The HTML attributes for the containing element.
+ * - link: A link to the file.
+ * - icon: An icon.
+ * - icon_only: Flag to display only the icon and not the label.
+ * - icon_position: Where an icon should be displayed.
+ *
+ * @ingroup templates
+ *
+ * @see \Drupal\bootstrap\Plugin\Preprocess\FileLink::preprocessVariables
+ */
+#}
+{% apply spaceless %}
+  {%
+    set classes = [
+      icon_only ? 'icon-only',
+      not icon_only ? 'icon-' ~ icon_position|clean_class
+    ]
+  %}
+  <span{{ attributes.addClass(classes) }}>
+    {% if icon_only %}
+      <span class="file-icon">{{ icon }}</span>
+      <span class="sr-only">
+        <span class="file-link">{{ link }}</span>
+        <span class="file-size">{{ file_size }}</span>
+      </span>
+    {% else %}
+      {% if icon_position == 'after' %}
+        <span class="file-link">{{ link }}</span><span class="file-size">{{ file_size }}</span><span class="file-icon">{{ icon }}</span>
+      {% else %}
+        <span class="file-icon">{{ icon }}</span><span class="file-link">{{ link }}</span><span class="file-size">{{ file_size }}</span>
+      {% endif %}
+    {% endif %}
+  </span>
+{% endapply %}

themes/bootstrap/templates/file/file-upload-help.html.twig

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+{#
+/**
+ * @file
+ * Theme override to display help text for file fields.
+ *
+ * Available variables:
+ * - description: The normal description for this field, specified by the user.
+ * - descriptions: Lines of help text for uploading a file.
+ * - popover: Markup to display the descriptions as a popover instead.
+ *
+ * @ingroup templates
+ *
+ * @see template_preprocess_file_upload_help()
+ */
+#}
+{% if description %}
+  {{ description }}<br>
+{% endif %}
+{% if popover %}
+  {{ popover }}
+{% else %}
+  {{ descriptions|safe_join('<br>') }}
+{% endif %}

themes/bootstrap/templates/file/image-widget.html.twig

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+{#
+/**
+ * @file
+ * Theme override for an image field widget.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - data: Render elements of the image widget.
+ *
+ * @ingroup templates
+ *
+ * @see template_preprocess_image_widget()
+ */
+#}
+{% if data.preview %}
+  <div{{ attributes.addClass('row') }}>
+    <div class="preview col-sm-2">
+      {{ data.preview }}
+    </div>
+    <div class="data col-sm-10">
+      {# Render widget data without the image preview that was output already. #}
+      {{ data|without('preview') }}
+    </div>
+  </div>
+{% else %}
+  <div{{ attributes.addClass(classes) }}>
+    {{ data }}
+  </div>
+{% endif %}